US1614294A

US1614294A - Emergency control lever

Info

Publication number: US1614294A
Application number: US109218A
Authority: US
Inventors: Robert S Gans
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-05-15
Filing date: 1926-05-15
Publication date: 1927-01-11
Anticipated expiration: 1944-01-11

Description

Jan. 11 1927.

R. s. GANS EMERGENCY CONTROL LEVER FiledMay 15, 1926 5 Sheets-Sheet 1 v I I INVENTOR. fiker-Z 'azzs.

I ATTORNEY.

Jan. 11 1927.

- INVl JNTOR. flier? 5 64226.

Jan. 11,1927. 1,614,294

R. S.-GAN$ EMERGENCY CONTROL LEVER Filed May 15, 1926 s Sheets-Sheet :5 v

I INVENTOR. 1903a? 5. 'ans BY I ATTORNEY.

Patented Jan. 11, 1927.

UNITED STATES.

ROBERT s. GANsfoF DETROIT, MICHIGAN.

EMERGENCY CONTROL LEVER.

Application filed May 15,

This invention relates to control levers, and especially an emergency brake lever which swings over a toothed segment. It is the object of the invention to provide a lever in which the usual pawl or dog is controlled by manipulating the lever itself and without the necessity of an additional pawl controlling rod, as is the common practice.

In the drawings:

Fig. 1 is a side elevation of the lower portion of the lever showing the lever locked in position.

Fig. 2 shows the position of thesarne parts afterthe dog has been released.

Fig. 3 showsthe position of the parts at the end of the back stroke just .before the dog is thrown back into engagement with the rack teeth. 5

Fig. 4 is a frontelevation of the parts.

Fig. 5 is a perspective of the fulcrum changing plate.

Fig. 6 is a detail perspective of the toggle arm.

Fig. 7 is a detail perspective of the dog.

Fig. 8 is a side elevation of a modified form of the invention.

Fig. 9 isa view similar to Fig. 8, but showing the position of the parts shifted.

Fig. 10 is a side elevation of the modified form showing the parts in still another position.

The brake lever designated a is provided with depending end 6. This lever, together with the auxiliary lever c is fulcrumed at the point (I on the segment 6. A pin f bears against the forward face of the depending end Z). When the lever is pulled back, this pin causes the auxiliary lever c to move for ward with the lower end of the main lever. The usual spring tension on the brake rod 72. always causes the auxiliary lever 0 to move back with the lower end of the brake rod.

2' designates a fulcrum changing plate which is fulcrumed on the auxiliary lever c by means of the pin This is provided with pin 70 which projects in the path of the heel m of the brake lever for a purpose soon to be described. This fulcrum changing plate carries a fulcrum pin a which projects into the slot 0 of the toggle lever g.

The toggle lever is coupled up with another toggle lever T which forms a dog or pawl. The knee of the toggle is found at the pin 8. Now the purpose of the fulcrumchanging plate is to change the fulcrum n of the toggle lever f from the top of the slot, as

1926. Serial No. 109,218.

shown in Fig. 2, to the bottom of the slot, as shown in Fig. Such a change has a very decided effect on the spring tension effort of the rod it on the toggle. In short, it reverses the spring tension effort in direction; for instance, in Fig. 1 the pull tends to keep the toggle arms to the right of the center line through the two fulcrums. On the other hand, with the fulcrum n in the position shown in Fig. 3 the draft of the rod it tends to throw the knee of the toggle arms to'the left of the center line between the two fulcrums. In this latter position the locking dog is released, in the other position the locking dog is held down in engagement with the teeth of the rack, as shown in Fig 1. -However, this is a yielding stress on the dog brought about by the spring that pulls on the draft rod. It will therefore be apparent that this dog can be engagechor disengaged by controlling the position of the fulcrum and that by shifting this to one side or the other of the line of draft, thedirection of pull on the toggle arms is reversed.

This shifting is controlled by manipulating the lever and by reason of the fulcrum changing plate. For instance, take the position shown in Fig..1,1the brake lever is in the on position. lease this, one pushes forward on the brake lever, thiscauses a slight relative movement between the auxiliary lever 0 and the brake lever. The heel of the brake lever strikes the pin is and throws the fulcrum changing plate over line of. draft of the rod it; that is, to the position shown in Fig. 3. This immediately reverses the direction of pull of the draft .rod on the toggle, and consequently causes the toggle arms to snap to the left.' The pull of the draft rod now tends to li-ft the dog out of the rack teeth, but due to the angle at which the teeth are set the dog is not lifted outuntil the brake lever is pulled back sufficiently to take the pull of the draft rod off of the rack teeth. The dognow immediately raises out of the rack teeth. This releases the lever and the same maybe pushed forward to its posi v tion of non-action. However, the lever is. pushed forward preferably with decision until the heel t of the.fulcrum-changing-plate strikes the abutment u, this again throws the fulcrum changing plate over the line of draft, changes the direction of pull onthe toggle, and the toggle arms again snap over center,

If it is desired-to re-.

the plate 6.

and the dog snaps into the rack teeth. This will now keep the lever from rattling, and it will be obvious that from this position the emergency lever may be quickly pulled to the on position, the dog dragging over the rack teeth in the usual way.

The modified form of the invention shown in Figs. 8, 9 and 10 is of a more simplified construction. In this form the lever a, which is fulcrumed to a stationary frame, has a depending end 6 which extends below a plate- 0 provided with rack teeth d.

To the lower end of this lever a plate 6 is secured the lever having a pin f extending through an elongated slot 9 in the plate 6. Another slot h is provided in this plate and a draft rod 91 is secured to the plate by a pin which extends through this slot. The plate 6 is shaped to provide a dog for engagen'ient with the rack teeth on the member c.

A. fulcrum changing plate 1; is hinged to the plate 6 at Z". This fulcrum changing plate is cut away as at m for engagement with the pin which secures the draft rod to This pin which secures the draft rod to the plate 6 is of suiiicient length to extend through the draft rod and both plates, and it may be in the form of a bolt \i or a hardened pin provided with holes for receiving cotter pins.

The fulcrum changing plate is also provided'with an aperture through which the pin f" extends. The shape of this aperture is shown in Fig. 1, one side of the aperture having a curved surface a, and the aperture is shaped so that a projection 0 extends into one end thereof sufficiently for engagement with the pin 7" when the parts are in one position.

In Fig. 8 the brake lever is in on position. The center line of pull of the draft rod from the fulcrum 7" is indicated by the line A A, and it will be observed that the draft rod is pulling below this line. This tends to swing the plate 6 about its fulcrum 7', thus causing the plate to engage with the rack teeth. To release the brake, the lever is pushed forward slightly and the fulcrum pin 7'" operates on the curved surface n of the plate 74. This swings the plate is around the hinge Z and thus raises the pin j to the upper end of the slot h to the position shown in dotted lines in Fig. 8. The draft of the brake now tends to swing the plate 6 around the fulcrum f so as to disengage it from the rack teeth. This is prevented by the angle of the rack teeth and the brake is still on. The lever is now pulled back sufficiently to take the pull of the draft rod, and to release the rack teeth of this pull, whereupon the plate 6 snaps downwardly and out of engagement with the rack teeth. In this position the pin f is received below the projection 0. The lever is now allowed to move forwardly and the brake is released. 7

The brake lever may be allowed to move forwardly with decision or may be allowed to spring forwardly by the spring action of the draft rod. In either case the fulcrum is changed when the brake lever reaches the end of its forward movement. This is accomplished automatically, as indicated in Fig. 10. The plate 0 is positioned immedi at-ely above the two plates 6 and 7c, and the plates are moved from right to left in Fig. 10 the upper surface of the plate is strikes the plate a. This moves the plate Z around its hinge and auses the pin 7" to move t the bottom of the slot it. At the same time the pin moves above the pro jection 0, it being understood that the downward movement of the plate 70 is sufficient to cause the fulcrum f to move around the projection 0 with more or less of asnap. The rack teeth are now engaged by the dog plate and the spring tension of the draft rod prevents the parts from rattling. Also the parts are in position to again be operated, and all that is necessary is for the operator to pull back on the lever.

It is important that the construction be such that the brake cannot be accidentally released. the draft rod is pulling from the bottom of this slot, and as heretofor set forth, a movement of the pin j to the upward end of the slot. would release the brake. occur accidentally by reason of the fact that the projection 0 engages the pin 7. This positively prevents rotation of the fulcrum changing plate 70 about its hinge Z and the pin 7" is thus positively held in the lowermost part of the slot it.

So far as I am aware, it is broadly new to provide a control for this dog which may be automatically exer iced by manipulating the operating lever, so I desire to have it understood that I claim this broadly, irrespective of the particular devices by which manipulation of the lever causes the pawl to be controlled.

l Vhat I claim is:

1. In a control device, a lever, a rack, a draft rod, a member for engagement with the rack for positioning the lever, and means for utilizing the pull of the draft rod to cause the said member to engage or disengage the rack.

2. In a control device, a lever, a rack, a draft rod, a member for engagement with the rack for positioning the lever, and means operable by manipulation of the lever for utilizing the pull of the draft rod to cause the said member to engage or disengage the rack.

33. In a control device, a lever, a rack, a draft rod, a member for engagement with the rack for positioning the lever, and means This cannot In the on position in Fig. 1

for shifting the line of pull of a draft rod to cause the said member to engage or disengage the rack.

at. A control lever having in combination a rack, a lever fulcrumed adjacent the rack, a dog pivotally connected with the lever and arranged to ride-freely over the rack in one direction, but to lock in the opposite direction, and devices for controlling the dog by the manipulation of the lever, comprising an auxiliary lever fulcrumed with first lever and carrying said dog'and members which snap the dog in or out of engagement with the ratchet teeth when the lever is moved relatively to the auxiliary lever 5. A control lever having in combination a rack, a lever fulcrumed adjacent the rack, a dog pivotally connected with the lever and arranged to ride freely over the rack in one direction, but to lock in the opposite direction, and devices for controlling the dog by the manipulation of the lever, comprising an auxiliary lever on which the said dog is pivoted, and snap-over center members which are arranged to snap the dog into or out of engagement with the teeth of the rack when the main lever is moved relatively to the auxiliary lever.

6. A control lever having in combination a rack, a lever fulcrumed adjacent the rack, a dog pivotally connected with the lever and arranged to ride freely over the rack in one direction, but to lock in the opposite direc tion, and devices for controlling the dog by the manipulation of the lever, comprising an auxiliary lever on which is fulcrumed the said dog and snap-over center members, and a spring tensioned draft rod connected with one of the snap-over center members, the said parts being arranged so that manipulati-on'of the main lever changes the direction of effort exercised by the draft rod on the snap-over center members to release the dog, or press it into engagement with the rack teeth.

7. A control lever having in combination a rack, a lever fulcrumed adjacent the rack, a dog pivotally connected with the lever and arranged to ride freely over the rack in one direction, but to lock in the opposite direction, and devices for controlling the dog by the manipulation of the lever, comprising an auxiliary lever, the said dog pivoted on said auxiliary lever and forming one member of the toggle, a second toggle arm pivoted on a second auxiliary lever, and a fulcrum-changing-plate carrying a fulcrum pin for the said second toggle arm, and a spring tensioned draft rod over the line of which the fulcrum pin of the fulcrum-changing-plate can be shifted by manipulating the said lever. V

8. A control lever having in combination a rack, provided with an abutment, a lever fulcrumed adjacent the rack, a dog pivotally connectedwiththe lever and-arranged to ride freelyover the rack in one direction, but to lock in the opposite direction, and devices for controlling thedog by themanipulation of'the lever, comprising an auxiliary lever having a co-axial fulcruming with the main'lever and susceptible of ,a limited movement with respect to the main lever, the said dog pivoted on said auxiliary lever and forming part of a toggle, a second toggle arm pivoted to the dog and having a slot and a fulcrum-changing-plate pivoted to the auxiliary lever andhaving a pin engaged in the slot of the second toggle arm, a spring tensioned draft arm connected to the second toggle arm, and over the line of draft of which the fulcrum pin can be shifted by movement of the fulcrum plate caused either by independent movement of the main lever with respect to the auxiliary lever and by striking the abutment at the end of the rack.

9. A control lever having in combination a pivoted lever, a rack, a dog connected to the lever for engagement with the rack, a draft rod connected to the dog, and means for changing the line of pull of the draft rod on the dogwhereby the dog is caused to engage or disengage the rack.

10. A control lever, having incombination a pivoted lever, a rack, a dog fulcrumed to the lever for engagement with the rack, a draft rod connected to the dog, the connection being such that the pull of the rod on the dog causes the dog to rotate around its fulcrum, and means operable by the movement of the lever for determining the direction of rotation of the dog as caused by the pull of the draftrod.

11. A control lever having in combination a pivoted lever, a rack, a dog fulcrumed to the lever forengagement with the rack, a draft rod; movably connected to the dog, this movable connection permitting the pull of the draft rod to be exerted on opposite sides of the normal center line of pull, thereby tending to rotate the dog around its fulcrum, and means operable by the movement of the lever to change the pull of the draft rod from one side of the center line to the other.

12. A control lever having in combination a pivoted lever, a rack, a dog fulcrumed to the lever for engagement with the rack, a draft rodmovably connected to the dog, this movable connection permitting the pull of the draft rod to be exerted on opposite sides of the normal center line of pull, thereby tending to rotate the dog around its fulcrum, a controlling member for controlling this movable connection between the draft rod and the dog, and means on the lever for governing the controlling action of this controlling member.

13. A control lever having in combinalit) tion a pivoted lever, a rack, a dog fulcrumed to the lever for engagement With the rack,

ment when the dog is in engagement With the rack.

14. In a control device, a lever, a draft rod connected to the lever and operable thereby, locking means for locking the lever in given positions which is controlled by the pull of the draft rod, and means operable to cause the pull of the draft rod to lock or unlock the said locking means.

ill

Intestimony whereof I have affixed my signature. 7

ROBERT S. GANS.